Power battery testing method, system, device, apparatus, and medium

Abstract

This invention discloses a power battery testing method, system, device, equipment, and medium. The power battery testing method includes: controlling a battery management system to enable the power battery to enter a charge-discharge mode; when the power battery is in charge-discharge mode, performing a charge-discharge test on the power battery based on at least one of the charge-discharge signal values ​​issued by the battery management system, external charging signal values, and reference power condition data, according to the test conditions; and adjusting the environmental parameters of the power battery according to the environmental requirements information of the power battery during the charge-discharge test so that the power battery can perform charge-discharge tests in the target environment; and obtaining the test results of the power battery based on the data generated by the charge-discharge test.

Description

Technical Field

[0001] This application relates to the technical fields of battery testing and evaluation, and in particular to a power battery testing method, system, device, equipment, and medium. Background Technology

[0002] With the popularization of new energy vehicles, power batteries have received increasing attention because they determine the performance of these vehicles. During winter and summer testing, issues such as fluctuating State of Charge (SOC), excessive battery temperature differences, and inaccurate remaining charging time can easily arise. Therefore, simulating the actual operating modes of power batteries under winter and summer vehicle conditions to test their performance, and thus facilitating further evaluation of vehicle reliability, performance, and lifespan, has become a key focus.

[0003] The power battery testing methods of related technologies only consider the performance of the power battery itself, without taking into account the actual environment in which the power battery is located and the safety of the power battery. This leads to test results that do not match reality and can easily damage the power battery. Summary of the Invention

[0004] In view of the above problems, this application provides a power battery testing method, system, device, equipment and medium, which can improve the testing effect of power batteries and reduce the damage to batteries caused by the testing process.

[0005] Firstly, this application provides a power battery testing method, which includes: controlling a battery management system to enable the power battery to enter a charge-discharge mode; when the power battery is in the charge-discharge mode, performing a charge-discharge test on the power battery based on at least one of the charge-discharge signal values ​​issued by the battery management system, external charging signal values, and reference power condition data, according to the test conditions; and adjusting the environmental parameters of the power battery according to the environmental requirements information of the power battery during the charge-discharge test so that the power battery can be charged-discharge tested in a target environment; and obtaining the test results of the power battery based on the data generated by the charge-discharge test.

[0006] In the technical solution of this application embodiment, based on test conditions, the power battery is subjected to charge-discharge tests according to at least one of the charge-discharge signal values ​​issued by the battery management system, external charging signal values, and reference power condition data. Conducting charge-discharge tests based on test condition data can verify the battery's adaptability and compatibility under different operating conditions, helping to ensure that the battery can meet the needs of various operating conditions in practical applications. Furthermore, adjusting the environmental parameters of the power battery according to its environmental requirements takes into account the actual environment in which the power battery operates, improving the accuracy of the test results.

[0007] In some embodiments, the charge / discharge signal values ​​issued by the battery management system include a fast charge request current signal value; based on the test conditions, a charge / discharge test is performed on the power battery according to at least one of the charge / discharge signal values ​​issued by the battery management system, an external charging signal value, and reference power condition data, including at least one of the following: when the test conditions indicate that the power battery needs to be fast charged, a fast charge test is performed on the power battery according to the fast charge request current signal value; when the test conditions indicate that the power battery needs to be slow charged, a slow charge test is performed on the power battery by selecting the minimum value from the fast charge request current signal value and the external charging signal value.

[0008] In the technical solution of this application embodiment, fast charging test and slow charging test of power battery can be realized according to the indication of different test conditions. When slow charging is required, the minimum value is selected from the fast charging request current signal value and the external charging signal value for charging. This can ensure that the charging current will not exceed the battery's tolerance range and reduce damage to the battery. This selection method can flexibly adjust the charging current according to the actual situation to adapt to different test requirements and battery status.

[0009] In some embodiments, the step of performing a charge-discharge test on the power battery based on at least one of the charge-discharge signal values ​​issued by the battery management system, the external charging signal values, and the reference power condition data under test conditions includes: when the test conditions indicate that the power battery needs to be discharged, performing a charge-discharge test on the power battery based on the test conditions and discharge protection requirements, according to at least one of the charge-discharge signal values ​​issued by the battery management system, the external charging signal values, and the reference power condition data.

[0010] In the technical solution of this application embodiment, the power battery is charged and discharged based on the discharge protection requirements, which can ensure that the battery is fully protected during the discharge process and avoid battery damage or safety accidents caused by over-discharge.

[0011] In some embodiments, the charge / discharge signal values ​​issued by the battery management system include an allowable discharge power signal value; based on test conditions and discharge protection requirements, the power battery is subjected to charge / discharge testing according to at least one of the charge / discharge signal values ​​issued by the battery management system, external charging signal values, and reference power condition data, including: when the test conditions indicate that the power battery needs to be discharged, the power battery is subjected to discharge testing according to the reference power condition data based on discharge protection requirements, and discharge protection is performed during the discharge process using the allowable discharge power signal value as the upper limit of discharge.

[0012] In the technical solution of this application embodiment, when the test condition indicates that the power battery needs to be discharged, the power battery is discharged based on the discharge protection requirements and the reference power condition data, making the test process more standardized and regulated. Furthermore, the discharge upper limit is set at the allowable discharge power signal value, which can effectively prevent the power battery from being over-discharged and protect the battery.

[0013] In some embodiments, the test conditions include at least one of low-temperature discharge test conditions, low-temperature driving battery temperature difference test conditions, high-temperature discharge test conditions, and low-temperature undervoltage test conditions, wherein: for the low-temperature discharge test conditions, low-temperature driving battery temperature difference test conditions, and high-temperature discharge test conditions, the reference power condition data includes a first discharge power, and the allowable discharge power signal value includes a continuously allowable discharge power signal value; for the low-temperature undervoltage test conditions, the reference power condition data includes a second discharge power, the second discharge power being greater than the first discharge power, and the allowable discharge power signal value including a maximum allowable instantaneous discharge power signal value.

[0014] In the technical solutions of this application embodiment, for low-temperature discharge test conditions, low-temperature driving battery temperature difference test conditions, and high-temperature discharge test conditions, the first discharge power is used as the reference power condition data. Combined with the continuous allowable discharge power signal value, the continuous discharge capability of the battery under different conditions can be evaluated while ensuring battery safety. For low-temperature undervoltage test conditions, the reference power condition data includes the second discharge power, which is greater than the first discharge power. The allowable discharge power signal value includes the maximum allowable instantaneous discharge power signal value, which can test the battery's extreme discharge capability and ensure that sufficient power can be provided in emergency situations. The setting of the maximum allowable instantaneous discharge power signal value can avoid excessive damage to the battery and ensure the safety of the test.

[0015] In some embodiments, obtaining the test results of the power battery based on the data generated by the charge-discharge test includes at least one of the following: calculating the data generated by the charge-discharge test to obtain the test results of the power battery; and determining the data generated by the charge-discharge test as the test results of the power battery.

[0016] In some embodiments, the data generated by the charge-discharge test is calculated to obtain the test result of the power battery, including at least one of the following: when the test conditions include at least one of low-temperature fast charging test conditions, low-temperature discharging test conditions, low-temperature slow charging test conditions, high-temperature fast charging test conditions, high-temperature discharging test conditions, and high-temperature slow charging test conditions, the charging capacity is calculated by integrating the charging current based on the current value and charging time of the power battery generated by the charge-discharge test, and the ratio of the charging capacity to the total charging capacity is obtained. Based on this ratio and the SOC value of the power battery, the SOC accuracy deviation of the battery is obtained, and the SOC accuracy deviation of the battery is determined as the test result of the power battery; when the test conditions include low-temperature charging remaining time accuracy test conditions and high-temperature charging remaining time accuracy test conditions, the charging capacity is calculated by integrating the charging current based on the current value and charging time ... the charging capacity is calculated by integrating the charging current based on the current value and charging time generated by the charge-discharge test, the charging capacity is calculated by integrating the charging current based on the current value and charging time generated by the charge-discharge test, the charging capacity is calculated by integrating the charging current based on the current value and charging time generated by the charge-discharge test, the charging capacity is calculated by integrating the charging current based on the current value and charging time generated by the charge-discharge test, the charging capacity is calculated by integrating the charging current based on the current value and charging time generated by the charge-discharge test, the charging capacity is calculated by integrating the charging current based on the current value and charging time generated by the charge-discharge test, Under test conditions, based on the actual charging time of the power battery charging process generated by the charge-discharge test and the estimated remaining charging time issued by the battery management system, the remaining charging time deviation is determined and used as the test result of the power battery. When the test conditions include the displayed SOC jump test, based on the displayed SOC value generated by the charge-discharge test, the displayed SOC change rate is determined and used as the test result of the power battery. Specifically, when performing the displayed SOC jump test, the power battery is discharged to a first specific value and calibrated. The actual SOC value issued by the battery management system is calibrated as a second specific value, and the power battery is discharged for testing. The second specific value is less than the first specific value.

[0017] In the technical solution of this application embodiment, when the test conditions include at least one of low-temperature fast charging test conditions, low-temperature discharging test conditions, low-temperature slow charging test conditions, high-temperature fast charging test conditions, high-temperature discharging test conditions, and high-temperature slow charging test conditions, the SOC accuracy deviation is used as the test result of the power battery; when the test conditions include low-temperature charging remaining time accuracy test conditions and high-temperature charging remaining time accuracy test conditions, the charging remaining time deviation is determined as the test result of the power battery; when the test conditions include a displayed SOC jump test condition, the displayed SOC change rate is determined as the test result of the power battery. In the above methods, different evaluation criteria are determined for different test conditions, making the test results more reliable.

[0018] In some embodiments, determining the data generated by the charge-discharge test as the test result of the power battery includes at least one of the following: when the test conditions include at least one of low-temperature fast charging test conditions, low-temperature slow charging test conditions, high-temperature fast charging test conditions, and high-temperature slow charging test conditions, determining at least one of the actual charging time of the power battery during the charging process, the temperature difference of the power battery during the charging process, and the maximum temperature of the power battery generated by the charge-discharge test as the test result of the power battery; when the test conditions include low-temperature discharge test conditions and high-temperature discharge test conditions, determining at least one of the temperature difference of the power battery during the discharge process and the maximum temperature of the power battery generated by the charge-discharge test as the test result of the power battery. First, the test results for the power battery are determined as follows: When the test conditions include low-temperature undervoltage test conditions, the undervoltage alarm information generated by the charge and discharge test or the displayed SOC value is determined as the target value and thus the test result for the power battery. Specifically, during the low-temperature undervoltage test, the power battery is discharged to the third specific value and calibrated. The actual SOC value issued by the battery management system is calibrated as the fourth specific value, and the power battery is then discharged. The fourth specific value is greater than the third specific value. When the test conditions include low-temperature driving battery temperature difference test conditions, the temperature difference of the power battery generated by the charge and discharge tests is determined as the test result for the power battery.

[0019] In the technical solution of this application embodiment, under different test conditions, the actual charging time of the power battery charging process, the temperature difference of the power battery during the charging process, the maximum temperature of the power battery, the undervoltage alarm information generated by the charge and discharge test, or the displayed SOC value can be used as test results. Multiple measurement standards are adopted for different test conditions to make the test results more reliable.

[0020] In some embodiments, the environmental demand information of the power battery includes at least one of thermal demand information and wind speed demand information, wherein the thermal demand information includes a thermal management demand status signal value issued by the battery management system or a thermal management strategy corresponding to the power battery.

[0021] In the technical solution of this application embodiment, the environmental information of the power battery includes at least one of thermal demand information and wind speed demand information, which is more consistent with the state of the power battery under real environment, improves the test effect, and the test plan is more realistic.

[0022] On the other hand, this application provides a power battery testing system for implementing any of the above-mentioned power battery testing methods. The power battery testing system includes: a power battery test bench configured to mount a power battery; a charge / discharge machine configured to charge and discharge the power battery; an environmental simulation device configured to adjust the environmental parameters of the power battery; and a monitoring device configured to control the charge / discharge machine to charge and discharge the power battery, and to control the environmental simulation device to adjust the environmental parameters of the power battery according to the environmental requirements information of the power battery.

[0023] In the technical solution of this application embodiment, the power battery testing system includes a power battery test bench, a charge / discharge machine, an environmental simulation device, and a monitoring device. It restores the real state of the power battery in the vehicle from multiple aspects, and the test results can better reflect the operating results under the actual environment, making it more reliable.

[0024] In some embodiments, the power battery stand includes: a power battery mounting component configured to carry a power battery; a support bracket disposed on the power battery mounting component, wherein the distance between the end of the support bracket away from the power battery mounting component and the power battery mounting component is a preset distance, the preset distance including the ground clearance between the power battery and the ground when the power battery is installed on a vehicle; and a packaging material configured to surround a specific surface of the power battery, the specific surface being the surface of the power battery excluding the surface carried by the power battery mounting component.

[0025] In the technical solution of this application embodiment, the power battery test bench includes a power battery mounting component, a raised bracket and packaging material, which simulates the interactive interface characteristics and ground clearance of the power battery installed on the vehicle, takes into account the state of the power battery in the actual vehicle environment, and can more realistically reflect the test results in the actual environment.

[0026] In some embodiments, the environmental simulation device includes at least one of a water chiller and a fan, wherein the water chiller is configured to provide the power battery with a simulated ambient temperature change and the fan is configured to provide the power battery with a wind speed.

[0027] In the technical solution of this application embodiment, by using environmental simulation equipment, such as at least one of water chillers and fans, the influence of wind field or temperature change on the power battery installed on the vehicle is simulated more realistically, and the test results under actual environment are more realistically reflected.

[0028] In some embodiments, the power battery testing system further includes a temperature chamber, in which the power battery, power battery stand, and fan are disposed.

[0029] In the technical solution of this application embodiment, the power battery testing system includes a temperature chamber, which is used to simulate different ambient temperatures when conducting winter and summer standard tests. The power battery, power battery test bench, and fan are all placed in the temperature chamber, taking into account the state of the power battery in the actual vehicle environment, and can more realistically reflect the test results under the actual environment.

[0030] On the other hand, this application provides a power battery testing device, which includes: a control module for controlling a battery management system to enable the power battery to enter a charge-discharge mode; a testing module for performing charge-discharge tests on the power battery based on at least one of the charge-discharge signal values ​​issued by the battery management system, external charging signal values, and reference power condition data when the power battery is in the charge-discharge mode; and adjusting the environmental parameters of the power battery according to the environmental requirements information of the power battery during the charge-discharge test so that the power battery can be charged-discharge tested in the target environment; and an acquisition module for obtaining the test results of the power battery based on the data generated by the charge-discharge test.

[0031] On the other hand, this application provides an electronic device including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method of any of the above embodiments.

[0032] On the other hand, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method of any of the above embodiments.

[0033] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0035] Figure 1 A flowchart of a power battery testing method provided for embodiments of this application;

[0036] Figure 2 A schematic diagram of the power battery testing system provided in another embodiment of this application;

[0037] Figure 3A schematic diagram of the power battery stand assembly according to an embodiment of this application is shown;

[0038] Figure 4 A block diagram of a power battery testing device provided in another embodiment of this application is shown. Detailed Implementation

[0039] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0042] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0044] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0045] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0046] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0047] With the popularization of new energy vehicles, power batteries have received increasing attention because they determine the performance of these vehicles. During winter and summer testing, issues such as fluctuating State of Charge (SOC), excessive battery temperature differences, and inaccurate remaining charging time can easily arise. Therefore, simulating the actual operating modes of power batteries under winter and summer vehicle conditions to test their performance, and thus facilitating further evaluation of vehicle reliability, performance, and lifespan, has become a key focus.

[0048] A method for testing the thermal management performance of a power battery system involves bench testing of the power battery to obtain heating / cooling times and energy consumption, thereby evaluating the thermal management performance of the power battery. This includes testing the low-temperature performance, high-temperature performance, and temperature uniformity of the power battery system, and providing a comprehensive evaluation. However, this technology only considers the performance of the power battery itself, neglecting the equivalence of test bench interfaces, environment, operating conditions, and the overall vehicle usage process. Furthermore, it fails to couple the complexities of actual use, leading to test results that do not accurately reflect reality. Additionally, related technologies do not consider battery safety during testing, potentially causing damage to the power battery.

[0049] In view of the above problems, this application provides a power battery testing method, which improves the testing effect of power batteries and reduces the damage to batteries caused by the testing process. It can predict the performance of the power battery system under the winter and summer standard environments of the whole vehicle, and realize the early interception of the high failure rate problem of the whole vehicle under the winter and summer standard.

[0050] Figure 1 A flowchart illustrating the power battery testing method provided in this application.

[0051] like Figure 1 As shown, the power battery testing method 100 provided in this application includes, for example, steps S110-S130.

[0052] Step S110: Control the battery management system to enable the power battery to enter the charging and discharging mode.

[0053] For example, a control device (such as a monitoring computer) can issue relevant instructions, which the Battery Management System (BMS) receives, causing the power battery to enter a charging / discharging mode. The battery management system can be located within the battery pack and may include chips.

[0054] Step S120: When the power battery enters the charging and discharging mode, based on the test conditions, the power battery is charged and discharged according to at least one of the charging and discharging signal values ​​issued by the battery management system, the external charging signal values, and the reference power condition data; and during the charging and discharging test of the power battery, the environmental parameters of the power battery are adjusted according to the environmental requirements information of the power battery so that the power battery can be charged and discharged in the target environment.

[0055] For example, the test conditions include fast charging, slow charging, and discharging. The power battery is charged and discharged based on at least one of the charge and discharge signal values ​​issued by the battery management system, the external charging signal values, and the reference power condition data. The external charging signal values ​​include, for example, the power values ​​of the on-board charger (OBC) component. During the charge and discharge test of the power battery, the environmental parameters of the power battery are adjusted according to the environmental requirements information of the power battery. The environmental parameters include, for example, temperature and wind speed.

[0056] Step S130: Based on the data generated from the charge-discharge test, obtain the test results of the power battery.

[0057] For example, the data generated by the charge and discharge test includes, for instance, actual charging time, temperature difference, etc., which can be analyzed to obtain the test results of the power battery.

[0058] In the technical solution of this application embodiment, based on test conditions, the power battery is subjected to charge-discharge tests according to at least one of the charge-discharge signal values ​​issued by the battery management system, external charging signal values, and reference power condition data. Conducting charge-discharge tests based on test condition data can verify the battery's adaptability and compatibility under different operating conditions, helping to ensure that the battery can meet the needs of various operating conditions in practical applications. Furthermore, adjusting the environmental parameters of the power battery according to its environmental requirements takes into account the actual environment in which the power battery operates, improving the accuracy of the test results.

[0059] In another example, the charge / discharge signal values ​​issued by the battery management system include a fast charge request current signal value. Based on the test conditions, the power battery is subjected to a charge / discharge test according to at least one of the charge / discharge signal values ​​issued by the battery management system, the external charging signal value, and the reference power condition data, including at least one of the following: when the test conditions indicate that the power battery needs to be fast charged, a fast charge test is performed on the power battery according to the fast charge request current signal value; when the test conditions indicate that the power battery needs to be slow charged, the minimum value is selected from the fast charge request current signal value and the external charging signal value to perform a slow charge test on the power battery.

[0060] For example, when the test condition indicates that the power battery needs to be fast charged, the battery management system is controlled via the Controller Area Network (CAN) bus to put the power battery into fast charging mode. The battery then charges according to the fast charging request current signal value issued by the battery management system until it is fully charged. When the test condition indicates that the power battery needs to be slow charged, the battery management system is controlled via the Controller Area Network (CAN) bus to put the power battery into slow charging mode. The battery then charges according to the lower of the fast charging request current signal value issued by the battery management system and the power value of the vehicle's OBC (On-Board Charger) component until it is fully charged.

[0061] For example, fast charging includes low-temperature fast charging and high-temperature fast charging, while slow charging includes low-temperature slow charging and high-temperature slow charging.

[0062] For low-temperature fast charging test conditions, low-temperature slow charging test conditions, after the power battery is fully discharged, it is placed in an environmental chamber (i.e., temperature chamber) for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber by ±2℃ (or other low-temperature conditions); the environmental chamber is kept at -20℃, and the monitoring computer, charging and discharging machine, water cooler and fan are started.

[0063] For high-temperature fast charging test conditions, high-temperature slow charging test conditions, etc., the power battery is fully discharged and placed in an environmental chamber for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber (45℃) by ±2℃ (or other high-temperature conditions); the environmental chamber is kept at 45℃, and the monitoring computer, charging and discharging machine, water cooler and fan are started.

[0064] The environmental chamber (temperature chamber), monitoring computer, charge / discharge machine, water chiller, fan, and CAN mentioned in the article are the main components of the power battery testing system, which will be described in detail below.

[0065] In the technical solution of this application embodiment, fast charging test and slow charging test of power battery can be realized according to the indication of different test conditions. When slow charging is required, the minimum value is selected from the fast charging request current signal value and the external charging signal value for charging. This can ensure that the charging current will not exceed the battery's tolerance range and reduce damage to the battery. This selection method can flexibly adjust the charging current according to the actual situation to adapt to different test requirements and battery status.

[0066] In another example, based on the test conditions, the power battery is subjected to a charge-discharge test according to at least one of the charge-discharge signal values ​​issued by the battery management system, the external charging signal values, and the reference power condition data. This includes: when the test conditions indicate that the power battery needs to be discharged, the power battery is subjected to a charge-discharge test according to at least one of the charge-discharge signal values ​​issued by the battery management system, the external charging signal values, and the reference power condition data, based on the test conditions and discharge protection requirements.

[0067] For example, the charge and discharge signal values ​​issued by the battery management system include the allowable discharge power signal value; based on the test conditions and discharge protection requirements, the power battery is charged and discharged according to at least one of the charge and discharge signal values ​​issued by the battery management system, the external charging signal value, and the reference power condition data, including: when the test conditions indicate that the power battery needs to be discharged, the power battery is discharged according to the reference power condition data based on the discharge protection requirements, and discharge protection is performed during the discharge process using the allowable discharge power signal value as the upper limit of discharge.

[0068] Conducting charge and discharge tests on power batteries based on discharge protection requirements can ensure that the batteries are adequately protected during the discharge process, avoiding battery damage or safety accidents caused by over-discharge.

[0069] For example, the discharge includes simulating vehicle driving to consume battery current. When the test condition indicates that the power battery needs to be discharged, the battery management system is controlled through the Controller Area Network (CAN) bus to make the power battery enter the discharge or driving mode. The discharge is carried out according to the China Light Vehicle Test Cycle (CLTC) provided by the vehicle manufacturer until the signal issued by the battery management system allows the continuous discharge power value to be equal to 0 kW. During the discharge process, the continuous allowable charge and discharge power signal value issued by the battery management system is used to set and protect the discharge limit (to avoid over-discharge situation when discharging based on the CLTC power condition table. The discharge limit refers to the smaller of the CLTC power and the continuous allowable charge and discharge power signal value).

[0070] For example, discharge includes low-temperature discharge and high-temperature discharge.

[0071] For low-temperature discharge test conditions, fully charge the power battery and place it in an environmental chamber for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber by ±2℃ (or other low-temperature conditions); maintain the environmental chamber at -20℃ and start the monitoring computer, charge / discharge machine, water cooler and fan.

[0072] For high-temperature discharge test conditions, the power battery is fully discharged and placed in an environmental chamber for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber (45℃) by ±2℃ (or other high-temperature conditions); the environmental chamber is kept at 45℃, and the monitoring computer, charge / discharge machine, water cooler and fan are started.

[0073] In the technical solution of this application embodiment, when the test condition indicates that the power battery needs to be discharged, the power battery is discharged based on the discharge protection requirements and the reference power condition data, making the test process more standardized and regulated. Furthermore, the discharge upper limit is set at the allowable discharge power signal value, which can effectively prevent the power battery from being over-discharged and protect the battery.

[0074] In some embodiments, the test conditions include at least one of low-temperature discharge test conditions, low-temperature driving battery temperature difference test conditions, high-temperature discharge test conditions, and low-temperature undervoltage test conditions, wherein: for the low-temperature discharge test conditions, low-temperature driving battery temperature difference test conditions, and high-temperature discharge test conditions, the reference power condition data includes a first discharge power, and the allowable discharge power signal value includes a continuously allowable discharge power signal value; for the low-temperature undervoltage test conditions, the reference power condition data includes a second discharge power, the second discharge power being greater than the first discharge power, and the allowable discharge power signal value including a maximum allowable instantaneous discharge power signal value.

[0075] For example, for low-temperature discharge test conditions, low-temperature driving battery temperature difference test conditions, and high-temperature discharge test conditions, the reference power condition data includes the first discharge power (i.e., the CLTC power condition table); for low-temperature undervoltage test conditions, the reference power condition data includes the second discharge power (i.e., the rapid increase and decrease power condition table).

[0076] For example, for low-temperature discharge test conditions and high-temperature discharge test conditions, the battery management system is controlled through the Controller Area Network (CAN) bus to enable the power battery to enter the discharge / driving mode and discharge according to the China Light Vehicle Test Cycle (CLTC) provided by the vehicle manufacturer until the signal issued by the battery management system allows the continuous discharge power value to be equal to 0 kW. During the discharge process, the continuous allowable charge and discharge power signal value issued by the battery management system is used to set and protect the discharge upper limit.

[0077] For low-temperature driving battery temperature difference testing, the temperature difference refers to the temperature difference of the battery pack. Multiple temperatures are collected from multiple locations within the battery pack, and the difference between the maximum and minimum temperatures is taken as the temperature difference. In actual vehicle use, the power battery undergoes charging and discharging cycles, which affects the generation and accumulation of temperature difference in the battery pack. Therefore, in order to better simulate the usage state of the power battery, a charge-discharge-charge mode test can be conducted. The charge-discharge-charge mode can better simulate the charging and discharging of the power battery in actual vehicle use with the fewest possible cycles, thereby improving the test results.

[0078] First, the power battery is fully discharged and placed in an environmental chamber for a certain period of time until its temperature is the same as or within ±2°C of the environmental chamber temperature (-20°C). The environmental chamber is then kept at -20°C. The monitoring computer, charge / discharge machine, water cooler, and fan are then started. The battery management system is controlled via the Controller Area Network (CAN) bus to put the power battery into fast charging mode. The battery battery is charged according to the fast charging request current signal value issued by the battery management system until it is fully charged.

[0079] Then, within a preset time period (e.g., 5 minutes), the battery management system is controlled via the Controller Area Network (CAN) bus to enable the power battery to enter discharge or driving mode and discharge according to the CLTC power condition table provided by the vehicle manufacturer until the signal issued by the battery management system allows the continuous discharge power value to be equal to 0 kW. During the discharge process, the continuous allowable charge and discharge power signal value issued by the battery management system is used to set and protect the discharge upper limit.

[0080] Next, within a preset time period (e.g., 5 minutes), the battery management system is controlled via the Controller Area Network (CAN) bus to enable the power battery to enter fast charging mode and charge according to the fast charging request current signal value issued by the battery management system until the power battery is fully charged.

[0081] After the charging-discharging cycle is completed, the temperature difference of the power battery is obtained. If the temperature difference is too large, it indicates that there is a problem with the battery pack.

[0082] For low-temperature undervoltage testing, the battery management system is controlled to put the power battery into discharge or driving mode, discharging according to the rapid power increase / decrease table provided by the vehicle manufacturer until the battery management system issues a level 2 undervoltage alarm (if a level 2 undervoltage alarm occurs before SOC = 0%, it indicates a fault has occurred during normal battery use) or displays SOC = 0% (indicating no fault, meaning the battery management system is discharging for protection according to the displayed SOC signal value). During the discharge process, the maximum permissible instantaneous charge / discharge power signal value issued by the battery management system is used to set and protect the upper limit of discharge.

[0083] In the technical solutions of this application embodiment, for low-temperature discharge test conditions, low-temperature driving battery temperature difference test conditions, and high-temperature discharge test conditions, the first discharge power is used as the reference power condition data. Combined with the continuous allowable discharge power signal value, the continuous discharge capability of the battery under different conditions can be evaluated while ensuring battery safety. For low-temperature undervoltage test conditions, the reference power condition data includes the second discharge power, which is greater than the first discharge power. The allowable discharge power signal value includes the maximum allowable instantaneous discharge power signal value, which can test the battery's extreme discharge capability and ensure that sufficient power can be provided in emergency situations. The setting of the maximum allowable instantaneous discharge power signal value can avoid excessive damage to the battery and ensure the safety of the test.

[0084] Based on the data generated from the charge-discharge test, the test results of the power battery are obtained, including at least one of the following: calculating the data generated from the charge-discharge test to obtain the test results of the power battery; or determining the data generated from the charge-discharge test as the test results of the power battery.

[0085] For example, some of the data generated from charge-discharge tests can directly reflect the state of the power battery, such as the actual charging time, temperature difference, and maximum temperature during the charging process. This data can be directly used as the test results of the power battery. However, some of the data generated from charge-discharge tests need to be calculated to obtain the final test results of the power battery, such as the SOC accuracy deviation and the rate of change of the displayed SOC.

[0086] In the technical solution of this application embodiment, the test results of the power battery are obtained by directly calculating the data generated by the charge and discharge test. The actual test data is used for calculation and is used as the test result, which can completely preserve the dynamic characteristic information of the battery and increase the reliability of the test results.

[0087] The data generated from the charge and discharge tests are calculated to obtain the test results of the power battery. The test results include the battery's SOC accuracy deviation, remaining charging time deviation, and displayed SOC change rate.

[0088] For the SOC accuracy deviation of the battery, under at least one of the test conditions including low temperature fast charging test condition, low temperature discharge test condition, low temperature slow charging test condition, high temperature fast charging test condition, high temperature discharge test condition, and high temperature slow charging test condition, the charging capacity is calculated by integrating the charging current based on the current value of the power battery generated by the charge and discharge test and the charging time, and the ratio of the charging capacity to the total charging capacity is obtained. Based on this ratio and the SOC value of the power battery, the SOC accuracy deviation of the battery is obtained, and the SOC accuracy deviation of the battery is determined as the test result of the power battery.

[0089] Regarding the remaining charging time deviation, under test conditions including low-temperature remaining charging time accuracy test conditions and high-temperature remaining charging time accuracy test conditions, the remaining charging time deviation is determined based on the actual charging time of the power battery charging process generated by the charge and discharge test and the estimated remaining charging time issued by the battery management system, and the remaining charging time deviation is determined as the test result of the power battery.

[0090] Regarding the displayed SOC change rate, in test conditions including the displayed SOC jump test condition, the displayed SOC change rate is determined based on the displayed SOC value generated by the charge and discharge test, and the displayed SOC change rate is determined as the test result of the power battery. Specifically, when performing the displayed SOC jump test, the power battery is discharged to the displayed SOC value of a first specific value and calibrated. The actual SOC value issued by the battery management system is calibrated as a second specific value, and the power battery is discharged for testing. The second specific value is less than the first specific value.

[0091] The data generated from charge-discharge tests are identified as test results for the power battery, including at least one of the following:

[0092] When the test conditions include at least one of the following: low temperature fast charging test condition, low temperature slow charging test condition, high temperature fast charging test condition, and high temperature slow charging test condition, at least one of the following—the actual charging time of the power battery during the charging process, the temperature difference of the power battery during the charging process, and the maximum temperature of the power battery—is determined as the test result of the power battery.

[0093] When the test conditions include low temperature discharge test conditions and high temperature discharge test conditions, the lesser of the temperature difference of the power battery during the discharge process generated by the charge and discharge test and the maximum temperature of the power battery shall be determined as the test result of the power battery.

[0094] When the test conditions include low temperature undervoltage test conditions, the undervoltage alarm information generated by the charge and discharge test or the displayed SOC value is determined as the target value and the test result of the power battery is determined. Specifically, when the low temperature undervoltage test is performed, the power battery is discharged to the displayed SOC value of the third specific value and calibrated. The actual SOC value issued by the battery management system is calibrated as the fourth specific value, and the power battery is discharged for test. The fourth specific value is greater than the third specific value.

[0095] When the test conditions include low-temperature driving battery temperature difference test conditions, the temperature difference of the power battery generated by the charging test and the discharging test is determined as the test result of the power battery.

[0096] Specifically, the following describes (1) low temperature fast charging test condition, (2) low temperature discharge test condition, (3) low temperature slow charging test condition, (4) low temperature charging remaining time accuracy test condition, (5) low temperature undervoltage test condition, (6) low temperature driving battery temperature difference test condition, (7) high temperature fast charging test condition, (8) high temperature discharge test condition, (9) high temperature slow charging test condition, (10) display SOC jump test condition, and (11) high temperature charging remaining time accuracy test condition.

[0097] (1) Low-temperature fast charging test conditions

[0098] The power battery is fully discharged and placed in an environmental chamber (temperature chamber) for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber by ±2℃ (-20℃).

[0099] The environmental chamber is maintained at -20℃. The monitoring computer, charge / discharge machine, water chiller, and fan are started. The battery management system is controlled via CAN communication, putting the power battery into fast charging mode. The battery charges according to the fast charging request current signal value issued by the battery management system until it is fully charged. Simultaneously, following the thermal management requirement status signal value issued by the battery management system and the corresponding thermal management strategy for the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the power battery is fully charged.

[0100] For example, the environmental demand information of the power battery includes at least one of thermal demand information and wind speed demand information, wherein the thermal demand information includes the thermal management demand status signal value issued by the battery management system or the thermal management strategy corresponding to the power battery.

[0101] For example, following the thermal management demand status signal value issued by the battery management system or the corresponding thermal management strategy of the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the power battery is fully charged.

[0102] Record the actual charging time of the power battery during the charging process (which can be used as a test result, and can also be used to compare with the remaining charging time displayed by the vehicle to obtain the charging time deviation as a test result), the temperature difference during the charging process (which can be used as a test result), the maximum temperature (which can be used as a test result), the SOC value and the current value (which are intermediate quantities and require further analysis).

[0103] The SOC accuracy deviation of the power battery (test results) is calculated. SOC accuracy is the cumulative percentage of capacity integrated with the charging current during the charging process minus the absolute value of the true SOC value (based on multiple sampling times, each corresponding to an absolute value). The absolute value of the largest difference is the SOC accuracy deviation during the charging process. The cumulative percentage of capacity is calculated by integrating the current over time (ampere-hours) to obtain the capacity, dividing this by the total charging capacity throughout the entire charging process.

[0104] (2) Low-temperature discharge test conditions

[0105] Fully charge the power battery and place it in an environmental chamber for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber by ±2℃ (-20℃).

[0106] The environmental chamber is maintained at -20℃. The monitoring computer, charge / discharge machine, water chiller, and fan are started. The battery management system is controlled via CAN communication to put the power battery into discharge or driving mode. Discharge is performed according to the China Light Vehicle Test Cycle (CLTC) provided by the OEM until the battery management system sends a signal allowing a continuous discharge power value of 0 kW. During discharge, the continuous allowable charge / discharge power signal from the battery management system is used to set and protect against over-discharge (avoiding over-discharge based on the CLTC power condition; the discharge limit is the smaller of the CLTC power and the continuous allowable charge / discharge power signal value). Simultaneously, following the thermal management requirement status signal or the corresponding thermal management strategy of the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the battery management system sends a signal allowing a continuous discharge power of 0 kW.

[0107] Record the temperature difference, maximum temperature, SOC value, and current value during the discharge process of the power battery.

[0108] The SOC accuracy deviation of the power battery is calculated. The SOC accuracy is the cumulative percentage of the capacity integrated by the charging current during the charging process minus the absolute value of the true SOC value (multiple sampling times, each sampling time corresponding to an absolute value). The absolute value of the maximum difference is the SOC accuracy deviation during the charging process.

[0109] (3) Low temperature slow charging test conditions

[0110] The power battery is fully discharged and placed in an environmental chamber for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber by ±2℃ (-20℃).

[0111] The ambient temperature is maintained at -20℃. The monitoring computer, charge / discharge machine, water chiller, and fan are started. The battery management system is controlled via CAN communication to put the power battery into slow charging mode. Charging is performed by taking the lower of the fast charging request current signal value issued by the battery management system and the power value of the vehicle's OBC component until the power battery is fully charged. Simultaneously, based on the thermal management requirement status signal value issued by the battery management system and the corresponding thermal management strategy for the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the power battery is fully charged.

[0112] Record the actual charging time of the power battery during the charging process (which can be used as a test result, or compared with the remaining charging time displayed by the vehicle to obtain the charging time deviation as a test result), the temperature difference, maximum temperature, SOC value and current value during the charging process.

[0113] The SOC accuracy of a power battery is calculated as the cumulative percentage of capacity integrated by the charging current during the charging process minus the absolute value of the true SOC value. The absolute value of the maximum difference is the SOC accuracy during the charging process.

[0114] (4) Low-temperature charging remaining time accuracy test condition

[0115] Discharge the power battery to a displayed SOC of 40%, place it in an ambient chamber for a certain period of time, until the temperature of the power battery is the same as or differs from the ambient chamber temperature of -20℃ by ±2℃.

[0116] The environmental chamber is maintained at -20℃. The monitoring computer, charge / discharge machine, water chiller, and fan are started. The battery management system is controlled via CAN communication, enabling the power battery to enter fast charging mode and charge according to the fast charging request current signal value issued by the battery management system until the power battery is fully charged.

[0117] Simultaneously, following the thermal management demand status signal value issued by the battery management system / the corresponding thermal management strategy of the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the power battery is fully charged.

[0118] Record the actual charging time during the power battery charging process and the value of the remaining charging time signal issued by the battery management system (issued before charging begins).

[0119] Calculate the remaining charging time deviation of the power battery.

[0120] Remaining charging time deviation = |Estimated remaining charging time at the start of charging - Actual charging time|.

[0121] (5) Low temperature undervoltage test condition

[0122] Battery undervoltage means that the current voltage of the battery is lower than the specified lower limit voltage.

[0123] Discharge the power battery to a displayed SOC of 30%, place it in an ambient chamber for a certain period of time, until the temperature of the power battery is the same as or differs from the ambient chamber temperature of -20℃ by ±2℃.

[0124] The actual SOC signal value emitted by the battery management system is calibrated to 35% (i.e., the fourth specific value), and the displayed SOC signal value is calibrated to 30% (i.e., the third specific value). The purpose of calibration is to simulate the SOC accuracy error. An error within 5% is acceptable in the industry. Calibration is equivalent to fault injection.

[0125] Maintaining an ambient temperature of -20℃, the monitoring computer, charge / discharge machine, water cooler, and fan are started. The battery management system is controlled via the Controller Area Network (CAN) bus, putting the power battery into discharge / driving mode. Discharge is performed according to the rapid acceleration / deceleration power condition table provided by the vehicle manufacturer until the battery management system issues a level 2 undervoltage alarm (if a level 2 undervoltage alarm occurs before SOC = 0%, it indicates a fault during normal battery use) or displays SOC = 0% (indicating no fault, meaning the battery management system is discharging according to the displayed SOC signal value, not the falsely advertised 35%). The test ends at this point. During discharge, the maximum permissible instantaneous charge / discharge power signal value issued by the battery management system is used to set and protect the discharge upper limit. Simultaneously, following the thermal management requirement status signal value / corresponding thermal management strategy issued by the battery management system, the water cooler is controlled to provide the corresponding heat source parameters until the battery management system issues a level 2 undervoltage alarm or displays SOC = 0%.

[0126] Since the threshold for the secondary undervoltage alarm changes with temperature, it is necessary to perform tests at multiple temperatures.

[0127] Discharge the power battery to a displayed SOC of 20%, place it in an ambient chamber for a certain period of time, until the temperature of the power battery is the same as or differs from the ambient chamber temperature of -10℃ by ±2℃.

[0128] The actual SOC signal value emitted by the battery management system is calibrated to 25% (i.e., the fourth specific value), and the displayed SOC signal value is calibrated to 20% (i.e., the third specific value).

[0129] Maintaining an ambient temperature of -10℃, the monitoring computer, charge / discharge machine, water chiller, and fan are activated. The battery management system is controlled via the Controller Area Network (CAN) bus, causing the power battery to enter discharge or driving mode. Discharge is performed according to the rapid acceleration / deceleration power condition table provided by the vehicle manufacturer until the battery management system issues a level-two undervoltage alarm or displays a SOC of 0%. During discharge, the maximum permissible instantaneous charge / discharge power signal value issued by the battery management system is used to set and protect the discharge upper limit. Simultaneously, following the thermal management requirement status signal value issued by the battery management system / the corresponding thermal management strategy of the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the battery management system issues a level-two undervoltage alarm or displays SOC = 0%.

[0130] (6) Low-temperature driving battery temperature difference test conditions

[0131] The power battery is fully discharged and placed in an environmental chamber for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber by ±2℃ (-20℃).

[0132] The environmental chamber is maintained at -20℃. The monitoring computer, charge / discharge machine, water chiller, and fan are started. The battery management system is controlled via CAN communication, putting the power battery into fast charging mode. The battery charges according to the fast charging request current signal value issued by the battery management system until it is fully charged. Simultaneously, following the thermal management requirement status signal value issued by the battery management system and the corresponding thermal management strategy for the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the power battery is fully charged.

[0133] Within 5 minutes, the battery management system (BMS) is controlled via CAN communication to put the power battery into discharge / driving mode. Discharge is performed according to the CLTC power condition table provided by the vehicle manufacturer until the BMS signals a continuous discharge power limit of 0 kW. During discharge, the continuous allowable charge / discharge power signal from the BMS is used to set and protect the discharge limit. Simultaneously, following the thermal management requirement status signal from the BMS and the corresponding thermal management strategy for the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the BMS signals a continuous discharge power limit of 0 kW. Within 5 minutes, the battery management system is controlled via CAN communication to put the power battery into fast charging mode. Charging is performed following the fast charging request current signal from the BMS until the power battery is fully charged. Simultaneously, following the thermal management requirement status signal from the BMS and the corresponding thermal management strategy for the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the power battery is fully charged. The charge-discharge-charge mode affects the generation and accumulation of temperature difference in the battery pack; after the test, the temperature difference is obtained. An excessively large temperature difference indicates a problem with the battery pack.

[0134] (7) High-temperature fast charging test conditions

[0135] The power battery is fully discharged and placed in an environmental chamber for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber (45℃) by ±2℃.

[0136] The environmental chamber is maintained at 45°C. The monitoring computer, charge / discharge machine, water chiller, and fan are started. The battery management system is controlled via CAN communication, putting the power battery into fast charging mode. The battery charges according to the fast charging request current signal value issued by the battery management system until it is fully charged. Simultaneously, following the thermal management requirement status signal value issued by the battery management system and the corresponding thermal management strategy for the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the power battery is fully charged.

[0137] Record the actual charging time, temperature difference, maximum temperature, SOC value, and current value during the charging process of the power battery.

[0138] The SOC accuracy of a power battery is calculated as the cumulative percentage of capacity integrated by the charging current during the charging process minus the absolute value of the true SOC value. The absolute value of the maximum difference is the SOC accuracy during the charging process.

[0139] (8) High-temperature discharge test conditions

[0140] Fully charge the power battery and place it in an environmental chamber for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber (45℃) by ±2℃.

[0141] The ambient temperature is maintained at 45℃. The monitoring computer, charge / discharge machine, water cooler, and fan are started. The battery management system is controlled via CAN communication, causing the power battery to enter discharge / driving mode. Discharge is performed according to the CLTC power condition table provided by the vehicle manufacturer until the battery management system sends a signal allowing a continuous discharge power value of 0kW. During discharge, the continuous allowable charge / discharge power signal from the battery management system is used to set and protect the discharge limit. Simultaneously, following the thermal management requirement status signal value from the battery management system and the corresponding thermal management strategy for the power battery, the water cooler is controlled to provide the corresponding heat source parameters until the battery management system sends a signal allowing a continuous discharge power value of 0kW.

[0142] Record the temperature difference, maximum temperature, SOC value, and current value during the discharge process of the power battery.

[0143] The SOC accuracy of a power battery is calculated as the cumulative percentage of capacity integrated by the discharge current during the discharge process minus the absolute value of the true SOC value. The absolute value of the maximum difference is the SOC accuracy during the discharge process.

[0144] (9) High-temperature slow charging test conditions

[0145] The power battery is fully discharged and placed in an environmental chamber for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber by ±2℃ (45℃).

[0146] The ambient temperature is maintained at 45℃. The monitoring computer, charge / discharge machine, water cooler, and fan are started. The battery management system is controlled via CAN communication to put the power battery into slow charging mode. Charging is performed by taking the lower of the fast charging request current signal value issued by the battery management system and the power value of the vehicle's OBC component until the power battery is fully charged. Simultaneously, based on the thermal management requirement status signal value issued by the battery management system and the corresponding thermal management strategy for the power battery, the water cooler is controlled to provide the corresponding heat source parameters until the power battery is fully charged.

[0147] Record the actual charging time, temperature difference, maximum temperature, SOC value, and current value during the charging process of the power battery.

[0148] The SOC accuracy of a power battery is calculated as the cumulative percentage of capacity integrated by the charging current during the charging process minus the absolute value of the true SOC value. The absolute value of the maximum difference is the SOC accuracy during the charging process.

[0149] (10) Display SOC jump test conditions

[0150] The SOC change test can include low-temperature and high-temperature tests. The SOC change rate refers to how quickly the charging display shows the battery level. For example, when the SOC is displayed normally, it increases steadily during charging. When the SOC is displayed abnormally, it will change abruptly.

[0151] For low-temperature testing, the power battery is discharged to a displayed SOC of 90%, and then placed in an environmental chamber for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber (25℃) by ±2℃.

[0152] The actual SOC signal value issued by the battery management system is calibrated to 85% (i.e., the second specific value), and the displayed SOC signal value is calibrated to 90% (i.e., the first specific value). At this point, charging another 10% will fully charge the battery. The purpose of calibration is to simulate SOC accuracy error. An error within 5% is acceptable in the industry. Calibration is essentially fault injection.

[0153] The environmental chamber is maintained at 25°C. The monitoring computer, charge / discharge machine, water chiller, and fan are started. The battery management system is controlled via CAN communication, putting the power battery into fast charging mode. The battery charges according to the fast charging request current signal value issued by the battery management system until it is fully charged. At the same time, according to the thermal management demand status signal value issued by the battery management system and the corresponding thermal management strategy of the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the power battery is fully charged.

[0154] For high-temperature testing, the power battery is discharged to a displayed SOC of 90%, and then placed in an environmental chamber for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber (45℃) by ±2℃.

[0155] The actual SOC signal value emitted by the battery management system is calibrated to 85% (i.e., the second specific value), and the displayed SOC signal value is calibrated to 90% (i.e., the first specific value).

[0156] The environmental chamber maintains a temperature of 45℃. The monitoring computer, charge / discharge machine, water chiller, and fan are activated. The battery management system is controlled via CAN communication, putting the power battery into fast charging mode. The battery charges according to the fast charging request current signal value issued by the battery management system until it is fully charged. Simultaneously, following the thermal management demand status signal value issued by the battery management system and the corresponding thermal management strategy for the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the power battery is fully charged.

[0157] Record the SOC value displayed by the battery management system during the charging process of the power battery.

[0158] Calculate the displayed SOC change rate of the power battery. For example, a displayed SOC change rate ≤ 1% / s is considered passing.

[0159] Test results include normal and abnormal SOC displays. A normal SOC display includes a continuous, steady increase in SOC during charging. After the battery is fully charged, it sends a full charge command and typically stops charging. During charging, the SOC steadily increases from 90% to 100%. An abnormal SOC display includes sudden jumps. For example, if the battery management system is calibrated to 85%, after charging another 10%, it should display 95%. However, if the battery is already fully charged, the battery pack will generate a full charge command and stop accepting further charging. In this case, the displayed SOC will jump directly from 95% to 100%, indicating an abnormal battery pack performance. By determining the rate of change of the displayed SOC, and defining this rate as the test result for the power battery, if the rate of change is less than or equal to a certain threshold (e.g., 1% / s), the battery pack test result is normal. If the rate of change is greater than the threshold (e.g., 1% / s), the battery pack test result is abnormal.

[0160] (11) High-temperature charging remaining time accuracy test conditions

[0161] The power battery is fully discharged (SOC = 0%) and placed in an environmental chamber for a certain period of time until the temperature of the power battery is the same as or differs from the temperature of the environmental chamber (45℃) by ±2℃.

[0162] The environmental chamber maintains a temperature of 45℃. The monitoring computer, charge / discharge machine, water chiller, and fan are activated. The battery management system is controlled via CAN communication, putting the power battery into fast charging mode. The battery charges according to the fast charging request current signal value issued by the battery management system until it is fully charged. Simultaneously, following the thermal management demand status signal value issued by the battery management system and the corresponding thermal management strategy for the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the power battery is fully charged.

[0163] Discharge the power battery to a displayed SOC of 40%, place it in an ambient chamber for a certain period of time, until the temperature of the power battery is the same as or differs from the ambient chamber temperature of 45℃ by ±2℃.

[0164] The environmental chamber maintains a temperature of 45℃. The monitoring computer, charge / discharge machine, water chiller, and fan are activated. The battery management system is controlled via CAN communication, putting the power battery into fast charging mode. The battery charges according to the fast charging request current signal value issued by the battery management system until it is fully charged. Simultaneously, following the thermal management demand status signal value issued by the battery management system and the corresponding thermal management strategy for the power battery, the water chiller is controlled to provide the corresponding heat source parameters until the power battery is fully charged.

[0165] Record the actual charging time during the power battery charging process and the value of the remaining charging time signaled by the battery management system.

[0166] Calculate the remaining charging time deviation of the power battery: Remaining charging time deviation = |BMS estimated remaining charging time - actual charging time|.

[0167] In the technical solution of this application embodiment, when the test conditions include at least one of low-temperature fast charging test conditions, low-temperature discharging test conditions, low-temperature slow charging test conditions, high-temperature fast charging test conditions, high-temperature discharging test conditions, and high-temperature slow charging test conditions, the SOC accuracy deviation is used as the test result of the power battery; when the test conditions include low-temperature charging remaining time accuracy test conditions and high-temperature charging remaining time accuracy test conditions, the charging remaining time deviation is determined as the test result of the power battery; when the test conditions include a displayed SOC jump test condition, the displayed SOC change rate is determined as the test result of the power battery. In the above methods, different evaluation criteria are determined for different test conditions, making the test results more reliable.

[0168] Figure 2 This is a schematic diagram of a power battery testing system provided in another embodiment of this application. The power battery testing system is used to implement any of the above-described power battery testing methods.

[0169] The power battery testing system includes: a power battery test bench configured to mount power batteries; a charge / discharge machine configured to charge and discharge the power batteries; an environmental simulation device configured to adjust the environmental parameters of the power batteries; and a monitoring device configured to control the charge / discharge machine to charge and discharge the power batteries, and to control the environmental simulation device to adjust the environmental parameters of the power batteries according to the environmental requirements information of the power batteries.

[0170] For example, such as Figure 2 As shown, the battery pack stand, or power battery stand, is used to install power batteries. The monitoring equipment, or monitoring computer, has the ability to output signals and set parameters. It can perform simple logic judgments and can realize one-click setting of current, target temperature, wind speed, and import temperature curves. It communicates with the battery pack stand via the Controller Area Network (CAN) bus (i.e., CAN communication) to obtain the real-time status of the battery pack, and then controls the actions and parameters of the charge / discharge machine and environmental simulation equipment. The charge / discharge machine is used to receive control commands and parameter requirements from the monitoring computer in real time, providing or consuming corresponding high-voltage electrical energy to the battery pack stand. It also communicates with the battery pack stand via the CAN bus to obtain the real-time status of the battery pack, ensuring the safe charging and discharging of the battery pack.

[0171] In the technical solution of this application embodiment, the power battery testing system includes a power battery test bench, a charge / discharge machine, an environmental simulation device, and a monitoring device. It restores the real state of the power battery in the vehicle from multiple aspects, and the test results can better reflect the operating results under the actual environment, making it more reliable.

[0172] In one example, the environmental simulation device includes at least one of a water chiller and a fan. The water chiller is configured to provide simulated ambient temperature changes to the power battery, and the fan is configured to provide airflow to the power battery. Related technologies typically involve directly heating the liquid to a preset temperature before injecting it into the battery pack, causing the battery pack's temperature to rise rapidly, which differs significantly from the temperature changes of the battery pack in a real environment. However, in this embodiment, the water chiller heats the liquid while simultaneously injecting it into the battery pack, allowing the ambient temperature of the battery pack to rise slowly, thus better simulating a real environment.

[0173] For example, such as Figure 2 As shown, the water chiller receives control commands and parameter requirements from the monitoring computer in real time. Based on the thermodynamic formula Q=C*M*ΔT, it simulates a constant-power heating method consistent with the ambient temperature. Q represents heat, C represents specific heat capacity, M represents the mass of the object (water), and ΔT represents the temperature change of the object. Once the internal heat source in the water tank of the water chiller reaches the parameter requirements (such as the set temperature), the control command is executed to provide heat source output to the battery pack test bench in real time. The fan receives control commands and parameter requirements from the monitoring computer in real time and provides corresponding wind speed conditions to the battery pack test bench, simulating the wind field environment of the battery pack in actual use within the vehicle.

[0174] In the technical solution of this application embodiment, by using environmental simulation equipment, such as at least one of water chillers and fans, the influence of wind field or temperature change on the power battery installed on the vehicle is simulated more realistically, and the test results under actual environment are more realistically reflected.

[0175] In another example, the power battery testing system also includes a temperature chamber, in which the power battery, power battery test bench, and fan are housed.

[0176] In the technical solution of this application embodiment, the power battery testing system includes a temperature chamber, which is used to simulate different ambient temperatures when conducting winter and summer standard tests. The power battery, power battery test bench, and fan are all placed in the temperature chamber, taking into account the state of the power battery in the actual vehicle environment, and can more realistically reflect the test results under the actual environment.

[0177] Figure 3 A schematic diagram of the power battery stand assembly according to an embodiment of this application is shown.

[0178] The power battery stand includes: a power battery mounting component configured to support a power battery; a support bracket disposed on the power battery mounting component, wherein the distance between the end of the support bracket away from the power battery mounting component and the power battery mounting component is a preset distance, the preset distance including the ground clearance between the power battery and the ground when the power battery is installed on the vehicle; and a packaging material configured to surround a specific surface of the power battery, the specific surface being the surface of the power battery excluding the surface supported by the power battery mounting component.

[0179] like Figure 3 As shown, the power battery test bench includes a mounting point (i.e., a power battery mounting component) for mounting the power battery; a raised support that can be extended or retracted as needed and adjusted to a preset distance during testing; and a packaging material used to surround the power battery to simulate the battery state under actual vehicle conditions.

[0180] In the technical solution of this application embodiment, the power battery test bench includes a power battery mounting component, a raised bracket and packaging material, which simulates the interactive interface characteristics and ground clearance of the power battery installed on the vehicle, takes into account the state of the power battery in the actual vehicle environment, and can more realistically reflect the test results in the actual environment.

[0181] The equivalent vehicle winter and summer standard power battery test scheme of the present invention is simple and can predict the performance of the power battery system in the vehicle winter and summer standard field, providing a reliable test scheme for evaluating the adaptability of the power battery system in extreme environments; thereby further facilitating the evaluation of the vehicle's reliability, performance and service life.

[0182] This application provides a power battery testing device 400. Please refer to [link to relevant documentation]. Figure 4 The power battery testing device 400 includes:

[0183] Control module 410 is used to control the battery management system to enable the power battery to enter the charging and discharging mode;

[0184] The test module 420 is used to perform charge and discharge tests on the power battery based on the test conditions, according to at least one of the charge and discharge signal values ​​issued by the battery management system, the external charging signal values, and the reference power condition data when the power battery enters the charge and discharge mode; and during the charge and discharge test of the power battery, adjust the environmental parameters of the power battery according to the environmental requirements information of the power battery so that the power battery can be charged and discharged in the target environment.

[0185] The module 430 is used to obtain the test results of the power battery based on the data generated by the charge and discharge test.

[0186] It is understandable that for a detailed description of the power battery testing device 400, please refer to the description of the power battery testing method above.

[0187] For example, the charging and discharging signal values ​​issued by the battery management system include fast charging request current signal values. The test module 420 is also used to: when the test condition indicates that the power battery needs to be fast charged, perform a fast charging test on the power battery according to the fast charging request current signal value; when the test condition indicates that the power battery needs to be slow charged, select the minimum value from the fast charging request current signal value and the external charging signal value to perform a slow charging test on the power battery.

[0188] For example, the test module 420 is further configured to: when the test condition indicates that the power battery needs to be discharged, perform a charge-discharge test on the power battery based on the test condition and discharge protection requirements, according to at least one of the charge-discharge signal values ​​issued by the battery management system, the external charging signal values, and the reference power condition data.

[0189] For example, the charge / discharge signal values ​​issued by the battery management system include the allowable discharge power signal value. Based on the test conditions and discharge protection requirements, the power battery is charged and discharged according to at least one of the charge / discharge signal values ​​issued by the battery management system, the external charging signal value, and the reference power condition data. This includes: when the test conditions indicate that the power battery needs to be discharged, the power battery is discharged according to the reference power condition data based on the discharge protection requirements, and discharge protection is performed during the discharge process using the allowable discharge power signal value as the upper limit of discharge.

[0190] For example, the test conditions include at least one of the following: low temperature discharge test condition, low temperature driving battery temperature difference test condition, high temperature discharge test condition, and low temperature undervoltage test condition, wherein: for the low temperature discharge test condition, the low temperature driving battery temperature difference test condition, and the high temperature discharge test condition, the reference power condition data includes a first discharge power, and the allowable discharge power signal value includes a continuous allowable discharge power signal value; for the low temperature undervoltage test condition, the reference power condition data includes a second discharge power, the second discharge power is greater than the first discharge power, and the allowable discharge power signal value includes a maximum allowable instantaneous discharge power signal value.

[0191] For example, the obtaining module 430 is further configured to: calculate the data generated by the charge-discharge test to obtain the test result of the power battery; and determine the data generated by the charge-discharge test as the test result of the power battery.

[0192] For example, when the test conditions include at least one of low-temperature fast charging test conditions, low-temperature discharging test conditions, low-temperature slow charging test conditions, high-temperature fast charging test conditions, high-temperature discharging test conditions, and high-temperature slow charging test conditions, the charging capacity is calculated by integrating the charging current based on the current value of the power battery generated by the charge-discharge test and the charging time. The ratio of the charging capacity to the total charging capacity is then obtained. Based on this ratio and the SOC value of the power battery, the SOC accuracy deviation of the battery is obtained, and the SOC accuracy deviation of the battery is determined as the test result of the power battery. When the test conditions include low-temperature charging remaining time accuracy test conditions and high-temperature charging remaining time accuracy test conditions, the charging capacity is calculated by integrating the charging current based on the current value of the power battery generated by the charge-discharge test and the charging time. The actual charging time during the power battery charging process and the estimated remaining charging time issued by the battery management system are used to determine the remaining charging time deviation, which is then used as the test result of the power battery. In test conditions including the displayed SOC jump test, the displayed SOC change rate is determined based on the displayed SOC value generated by the charge and discharge test, and is used as the test result of the power battery. Specifically, during the displayed SOC jump test, the power battery is discharged to a first specific value and calibrated. The actual SOC value issued by the battery management system is calibrated as a second specific value, and the power battery is then discharged. The second specific value is less than the first specific value.

[0193] For example, when the test conditions include at least one of low-temperature fast charging test conditions, low-temperature slow charging test conditions, high-temperature fast charging test conditions, and high-temperature slow charging test conditions, at least one of the following—the actual charging time of the power battery during the charging process, the temperature difference of the power battery during the charging process, and the maximum temperature of the power battery—is determined as the test result of the power battery; when the test conditions include low-temperature discharge test conditions and high-temperature discharge test conditions, at least one of the following—the temperature difference of the power battery during the discharge process and the maximum temperature of the power battery—is determined as the test result of the power battery; in the test conditions... In cases including low-temperature undervoltage testing, the undervoltage alarm information generated by the charge / discharge test or the displayed SOC value is taken as the target value and determined as the test result of the power battery. Specifically, during the low-temperature undervoltage test, the power battery is discharged to the displayed SOC value of the third specific value and calibrated. The actual SOC value issued by the battery management system is calibrated as the fourth specific value, and the power battery is discharged for testing. The fourth specific value is greater than the third specific value. In cases including low-temperature driving battery temperature difference testing, the temperature difference of the power battery generated by the charge and discharge tests is taken as the test result of the power battery.

[0194] For example, the environmental demand information of the power battery includes at least one of thermal demand information and wind speed demand information, wherein the thermal demand information includes a thermal management demand status signal value issued by the battery management system or a thermal management strategy corresponding to the power battery.

[0195] This application provides an electronic device, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps of the method described in any of the above embodiments.

[0196] On the other hand, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method of any of the above embodiments.

[0197] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequential list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this application, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which programs can be printed, because programs can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0198] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0199] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for testing power batteries, characterized in that, The power battery testing method includes: The battery management system controls the power battery to enter charging and discharging mode. When the power battery enters the charging and discharging mode, based on the test conditions, the power battery is charged and discharged according to at least one of the charging and discharging signal values ​​issued by the battery management system, the external charging signal values, and the reference power condition data; and during the charging and discharging test of the power battery, the environmental parameters of the power battery are adjusted according to the environmental requirements information of the power battery so that the power battery can be charged and discharged in the target environment. The test results of the power battery are obtained based on the data generated from the charge and discharge test.

2. The power battery testing method according to claim 1, characterized in that, The charge / discharge signal values ​​issued by the battery management system include fast charging request current signal values; the charge / discharge test of the power battery based on the test conditions, according to at least one of the charge / discharge signal values ​​issued by the battery management system, external charging signal values, and reference power condition data, includes at least one of the following: When the test condition indicates that the power battery needs to be fast charged, a fast charging test is performed on the power battery according to the fast charging request current signal value. When the test condition indicates that the power battery needs to be slowly charged, the minimum value is selected from the fast charging request current signal value and the external charging signal value to perform a slow charging test on the power battery.

3. The power battery testing method according to claim 1, characterized in that, The method of conducting a charge-discharge test on the power battery based on at least one of the following: charge / discharge signal values ​​issued by the battery management system, external charging signal values, and reference power condition data, under test conditions, includes: When the test condition indicates that the power battery needs to be discharged, the power battery is subjected to a charge-discharge test based on the test condition and discharge protection requirements, according to at least one of the charge-discharge signal values ​​issued by the battery management system, the external charging signal values, and the reference power condition data.

4. The power battery testing method according to claim 3, characterized in that, The charge / discharge signal values ​​issued by the battery management system include the allowable discharge power signal value; the charge / discharge test of the power battery based on test conditions and discharge protection requirements, according to at least one of the charge / discharge signal values ​​issued by the battery management system, the external charging signal value, and the reference power condition data, includes: When the test condition indicates that the power battery needs to be discharged, based on the discharge protection requirements, the power battery is discharged according to the reference power condition data, and the allowable discharge power signal value is used as the upper limit of discharge protection during the discharge process.

5. The power battery testing method according to claim 4, characterized in that, The test conditions include at least one of the following: low-temperature discharge test condition, low-temperature vehicle battery temperature difference test condition, high-temperature discharge test condition, and low-temperature undervoltage test condition, wherein: For the low-temperature discharge test condition, the low-temperature vehicle battery temperature difference test condition, and the high-temperature discharge test condition, the reference power condition data includes the first discharge power, and the allowable discharge power signal value includes the continuous allowable discharge power signal value. For the low-temperature undervoltage test condition, the reference power condition data includes a second discharge power, which is greater than the first discharge power, and the allowable discharge power signal value includes the maximum allowable instantaneous discharge power signal value.

6. The power battery testing method according to any one of claims 1-5, characterized in that, The test results of the power battery obtained from the data generated by the charge-discharge test include at least one of the following: The test results of the power battery are obtained by calculating the data generated from the charge and discharge test. The data generated from the charge-discharge test is determined as the test result of the power battery.

7. The power battery testing method according to claim 6, characterized in that, The calculation of the data generated from the charge-discharge test to obtain the test results of the power battery includes at least one of the following: When the test conditions include at least one of low temperature fast charging test condition, low temperature discharge test condition, low temperature slow charging test condition, high temperature fast charging test condition, high temperature discharge test condition, and high temperature slow charging test condition, the charging capacity is calculated by integrating the charging current based on the current value of the power battery generated by the charge and discharge test and the charging time, and the ratio of the charging capacity to the total charging capacity is obtained. Based on the ratio and the SOC value of the power battery, the SOC accuracy deviation of the battery is obtained, and the SOC accuracy deviation of the battery is determined as the test result of the power battery. When the test conditions include low temperature charging remaining time accuracy test conditions and high temperature charging remaining time accuracy test conditions, the charging remaining time deviation is determined based on the actual charging time of the power battery charging process generated by the charge and discharge test and the charging remaining time estimate issued by the battery management system, and the charging remaining time deviation is determined as the test result of the power battery. When the test conditions include the display SOC jump test condition, the display SOC change rate is determined based on the displayed SOC value generated by the charge and discharge test, and the display SOC change rate is determined as the test result of the power battery. Specifically, when performing the display SOC jump test, the power battery is discharged to the displayed SOC value of a first specific value and calibrated. The actual SOC value issued by the battery management system is calibrated as a second specific value, and the power battery is subjected to a discharge test. The second specific value is less than the first specific value.

8. The power battery testing method according to claim 6, characterized in that, The determination of the data generated from the charge-discharge test as the test result of the power battery includes at least one of the following: When the test conditions include at least one of low temperature fast charging test conditions, low temperature slow charging test conditions, high temperature fast charging test conditions, and high temperature slow charging test conditions, at least one of the following—the actual charging time of the power battery during the charging process, the temperature difference of the power battery during the charging process, and the maximum temperature of the power battery—is determined as the test result of the power battery. When the test conditions include low-temperature discharge test conditions and high-temperature discharge test conditions, at least one of the temperature difference of the power battery during the discharge process generated by the charge and discharge test and the maximum temperature of the power battery shall be determined as the test result of the power battery. When the test conditions include low temperature undervoltage test conditions, the undervoltage alarm information generated by the charge and discharge test or the displayed SOC value is determined as the target value and the test result of the power battery is determined. In the case of low temperature undervoltage test, the power battery is discharged to the displayed SOC value of the third specific value and calibrated. The actual SOC value issued by the battery management system is calibrated as the fourth specific value, and the power battery is discharged for test. The fourth specific value is greater than the third specific value. When the test conditions include low-temperature driving battery temperature difference test conditions, the test result of the power battery is determined based on the temperature difference of the power battery generated by the charging test and the discharging test.

9. The power battery testing method according to any one of claims 1-5, 7, and 8, characterized in that, The environmental demand information of the power battery includes at least one of thermal demand information and wind speed demand information, wherein the thermal demand information includes a thermal management demand status signal value issued by the battery management system or a thermal management strategy corresponding to the power battery.

10. A power battery testing system, characterized in that, The power battery testing system is used to implement the power battery testing method according to any one of claims 1-9, and the power battery testing system includes: A power battery stand is configured to mount the power battery. A charge / discharger is configured to charge and discharge the power battery; An environmental simulation device is configured to adjust the environmental parameters of the power battery; The monitoring equipment is configured to control the charger to charge and discharge the power battery, and to control the environmental simulation equipment to adjust the environmental parameters of the power battery according to the environmental requirements information of the power battery.

11. The power battery testing system according to claim 10, characterized in that, The power battery test bench includes: A power battery mounting component is configured to carry the power battery; A raised bracket is provided on the power battery mounting component. The distance between the end of the raised bracket away from the power battery mounting component and the power battery mounting component is a preset distance. The preset distance includes the ground clearance between the power battery and the ground when the power battery is installed on the vehicle. The packaging material is configured to surround a specific surface of the power battery, the specific surface being all the surfaces of the power battery except the surface supported by the power battery mounting component.

12. The power battery testing system according to claim 10 or 11, characterized in that, The environmental simulation device includes at least one of a water chiller and a fan, the water chiller being configured to provide the power battery with a simulated ambient temperature change, and the fan being configured to provide the power battery with a wind speed.

13. The power battery testing system according to claim 12, characterized in that, The power battery testing system also includes a temperature chamber, in which the power battery, the power battery test bench, and the fan are housed.

14. A power battery testing device, characterized in that, The power battery testing device includes: The control module is used to control the battery management system to enable the power battery to enter charging and discharging mode; The testing module is used to perform charge and discharge tests on the power battery based on test conditions, according to at least one of the charge and discharge signal values ​​issued by the battery management system, the external charging signal value, and the reference power condition data when the power battery enters the charge and discharge mode; and during the charge and discharge test of the power battery, adjust the environmental parameters of the power battery according to the environmental requirements information of the power battery so that the power battery can be charged and discharged in the target environment. The module is used to obtain the test results of the power battery based on the data generated by the charge and discharge test.

15. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1-9.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1-9.

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